babcock



(No Model.)

G. H. BABGOOK, S. WILOOX & N. W. PRATT.

Steam Boiler. No. 240,358. Patented April 19,1881.

MIPETERS, PHQTO-LITHOGRAPMER;WASH:NTON. D. C.

GEORGE H. BABOOOK, OF PLAINFIELD, NEW JERSEY, AND STEPHEN WILOOX AND NATHANIEL W.'PRATT, OF BROOKLYN, NET V YORK, ASSIGNORS TO SAID BABOOGK AND WILGOX.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 240,358, dated April 19, 1881.

' Application filed Octoberzl, 1880. (No model.)

To all whom it may concern: Be it known that we, GEORGE H. BABCOOK, of Plainfield, Union county, in the State of New Jersey, and STEPHEN WILcoX and NA- 5 THANIEL W. PRATT, both of Brooklyn, in the county of Kings and State of New York, all citizens of the United States, have invented certain new and useful Improvements relating to Steam-Boilers, of which the following is aspecification.

Our improved boiler is of the type known as Babcock & WVilcoX, having the principal steam-generating surface in the form of iiiclined tubes with their ends connected together I 5 and to a drum or barrel above, in which latter the steam is allowed to separate from the water which circulates actively through the system.

We have in the patent to us dated June 29,

1880, No. 229,352, described a modification in which, among other peculiarities, we introduced a wall of nearly vertical tubes on each side of the heated space below the barrel. Our present invention is an improvementthereon. We have widened the furnace and the entire heated space below the boiler relatively to the diameter of the barrel or drum, and have provided chambers extending along and connecting the tops of the side tubes with in- 0 elined tubes connecting these chambers with the drum at intervals. lVe have covered the top space by removable covers. We have placed the side tubes at a little distance apart, instead of attempting to make a tight wall by 5 placing the bodies of the tubes in contact, and

have provided a thin non-conducting wall exterior to the side tubes. We have placed the side tubes upright instead of inclined, and have omitted a sufficient number toward the rear on each side to form a sufficient man-hole to facilitate repairs. Our small drum is unincumbered by any internal lines, the products of combustion being allowed to move directly upward into the stack at the rear of the boiler.

The following is a description of what we consider the best means of carrying out the invention.

The accompanying drawings form a part of this specification.

Figure 1 is a side elevation, partly in section. Fig. 2 is a cross-section on the line S S in Fig. 1.

Similar letters of referenceindicate like parts in both the figures.

Ais the drum; M, the inclined tubes, which form'the principal heating-surface, and which we will, for convenience, designate as the main tubes, D, the front connections; G, the back connections, and H a series of tubes which lead up from the back connections to the boiler. YV e give such a length to the main tubes M that the connections D and G protrude a little beyond the adjacent end of the drum. The pipes which communicate between these front and rear connections and the drum do not, as in the former plan, lead into saddles under the ends of the drum, but into chambers projecting beyond the ends. Such front chamber is marked A and the roar chamber A The side tubes are marked T. Their tops are connected by chambers 1?, their bottoms by chambers P. The tubes T in each set stand upright a little distance apart. The two sets are considerablywider apart than the diameter of the drum. The top chambers, P, are made to communicate with the drum by short inclined tubes The bottom chambers, P, communicate at the rear, through thimbles O, with a transverse mud-drum, K. This in turn communicates with the back connections, G, by thimbles L. Exterior to the tubes T, on each side, we make a tight wall of thin firebrick, as indicated by V, and outside of that provide a thin metallic casing, N. The outside casing, N, is connected to the drum bya removable top casin g, X} under which latter, and between it and the inclined tubes P we provide a series ofremovable tiles or fire-bricks, W. The series of tubes T at each side commence at the front end of the drum and continue uniformly rearward nearly to the back end of the drum, but not quite. We leave a sufficient space, t, for a man to go in and out between the rearmost of the side tu'bes, T, and the series of the tubes H, which extend across the back. It will be understood that this space is to be secured by a door (not'represented) in the side casing, which serves as a cleaningdoor. A removable casing is provided at the extreme front and rear, which allows access to these parts for cleaning and repairs.

The front and rear connections, D and G, are preferably formed, as represented in our said patent of June 29, 1880, with apertures, to allow a strong jet of steam to be blown in at intervals to clear away ashes and soot in the space between the tubes M.

The upper portion, A of the casing at the rear is inclined, and the gases are allowed to move rearward at that point and enter directly into a stack, A

The top chambers, P, and.bottom chambers, P, are made in two sections, connected by thimbles.

It will be understood that the series of tubes H, which are placed vertically across the back, are a. sufficient distance apart to allow the gases to escape between them.

Modifications may be made in the forms and proportions of the details. The number of the sections P P on each side may be increased. The tubes T may be reduced in diameter at each end and mounted, as shown in our previous patent, with their bodies nearly or quite in contact. The number of the connections P* between the top chambers, P, and the drum A may be increased or diminished. The grate may be inclined more or less than shown. There may be hand-holes or a man-hole in the drum, secured in the ordinary manner, and a nearly horizontal partition or baffle-plate may may extend forward over a portion of the furnace from the top of the partial front partition, E, in the same manner as in our patent of June, 1880, above referred to.

Our invention allows the use of the ordinary attachments, gage-cocks, blow-off cocks, and,

the like.

Our boiler may be fed with hot or cold water introduced at any convenient point. We propose to use this boiler, either singly or in sets, for marine or land purposes. We esteem it especially applicable for marine boilers. Of course, where a number are used side by side, what we have shown as the stack A will be replaced by a horizontal, or nearly horizontal,

connection leading the gases from the whole into one upright stack.

Our improved construction provides a liberal width of furnace and great heating-surface with only a moderate diameter of the steam-drum.

By removing the parts X and W we can introduce a steam-nozzle through the liberal spaces between the pipes P and project a strong blast of steam in, various directions downward among the tubes M. This allows the easy removal of all ashes and soot from the middle length of the tubes M, and may suffice also to clear the spaces quite up to the ends of each, so that there will rarely be any need of blowing steam endwise into these spaces.

The spaces between the side tubes, T, and the non-conducting wall V outside the same makes the whole surface of these tubes available as heating and steam-generating surface. The water descends through the back connections and the rearmost of the side connections, T, where the heat is moderate and but little steam is generated to resist the descent, and moves forward in the bottom connections, P, to ascend where the heat is fierce and much steam generated at the sides of the grate. The gases are discharged at the rear of the furnace with their temperature sufficiently lowered Without the complication of the structure by any internal flues in the drum or barrel A.

It is not absolutely essential to success that the removable covers W and X be made separate. We propose in some cases to make a thick cover with an iron plate for the top and suitable fire-brick for the bottom, and to remove and replace the whole together.

We claim as our invention- 1. The top connections,P*, as shown,in combination with the barrel A, top chambers, P, side pipes, T, bottom chambers, P, and main pipes M, with suitable front and back connections, arranged for joint operation as herein specified.

2. The removable cover W, arranged as shown, in combination with the inclined pipes P*, system of side pipes, T, and chambers P P, and with a system of main pipes M and front and back connect-ions, D G H, as and for the purposes herein specified.

3. In a steam-boiler having a barrel, A, main tubes M, front and rear connections, D G, pipes H, and side tubes, T, with top and bottom connections, P P, the space 15 between the rear of the series of pipes T, to serve as a cleaningpassage, as herein specified.

4. In a steam-generating apparatus having abarrel, -A, inclined tubes M, and suitable front and back connections from the latter to the barrel, the casing N, non-conducting wall V, and'side tubes, T, in combination with each other and with top and bottom chambers, P and P, and suitable connections therefrom to the other parts, as herein specified.

In testimony whereof we haye hereunto set our hands, at New York city, New York, this 20th day of October, 1880, in the presence of two subscribing witnesses.

GEO. H. BABGOOK. STEPHEN WILOOX. NAT. W. PRATT. Witnesses:

ALEX. B. VAN WAGNER, CHARLES C. STETSON. 

